====== NAT logging for Cisco ASR ======


Cisco ASR 1000 series routers are popular as internet edge device. One of the functions ASR 1K provides is NAT deployed to conserve public IP space.   For these ISPs keeping a log of NAT translations is a regulatory compliance called IPDR (IP Data Record).  Trisul Network Analytics IPDR helps ISPs meet this compliance requirement. 

This note explains how you can configure NAT logging on ASR

===== Use NetFlow NAT Logging =====

Cisco recommends that you use the purpose designed NetFlow mechanism rather than other methods like SYSLOG.

It is as simple as a single command. You do not need to enable it on a interface by interface basis unlike  plain NetFlow

<code>
ip nat log translations flow-export v9 udp destination 10.17.17.17  2055
</code>


Where 10.17.17.17 is the IP Address of the NetFlow collector.